Chapter 1: Chemical reactions and equations

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Chemical reactions and equations


Explain the following in terms of gain or loss of oxygen with two examples each:

(a) Oxidation

(b) Reduction


(a)- The oxidation reaction is a reaction in which the substance gains oxygen during the reaction.

Example 1: Sulphur gains oxygen when reacts with oxygen gas to form sulphur dioxide.

S (s) + O2 (g) → SO2 (g)

Example 2: Potassium chloride gains oxygen to form potassium chlorate.

2KCl (s) + 3O2 (g) → 2KClO3 (s)


(b)- The reduction reaction is the type of reaction in which the substance loses oxygen during the chemical reaction.

Example 1: Zinc oxide loses oxygen when reacts with carbon to form zinc and carbon monoxide.

ZnO (s) + C (s) → Zn (s) + CO (g)

Example 2: Copper oxide loses oxygen when reacts with hydrogen gas to form copper and water.

CuO (s) + H2 (g) → Cu (s) + H2O (l)

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